Pyrite in Quartzite/Graphite Matrix
Iron Sulfide (FeS2)
Mineral
Category
Sedimentary And Igneous (Mixed)
Browse sedimentary and igneous (mixed) specimens identified by the Rock Identifier community.
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Polished red jasper
Jasper, microcrystalline quartz (SiO₂), colored by iron oxides and commonly mixed with chalcedony or other minerals
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite in Quartz
Iron Sulfide (FeS2) on Silicon Dioxide (SiO2)
mineral
Geode
Silicon dioxide (Quartz/Chalcedony) concretion
sedimentary
Jasper
Silicon dioxide (Microcrystalline Quartz, SiO2)
sedimentary
Pyrite
Iron Sulfide (FeS2)
mineral
Jasper
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Leopard Jasper
Microcrystalline Quartz (Chalcedony)
sedimentary
Pyrite-bearing rock (likely pyrite-rich schist or massive pyrite)
Pyrite, FeS₂, possibly in a micaceous metamorphic matrix
mineral
Orange Quartz (or Carnelian Chalcedony)
Silicon Dioxide (SiO2)
mineral
Conglomerate (likely iron-stained, mixed-pebble conglomerate)
Polymictic conglomerate; rounded clasts cemented in a finer-grained matrix
sedimentary
Jasper
Microcrystalline quartz (SiO2)
sedimentary
Jasper Pendant
Silicon dioxide (SiO2) with impurities
Mineral/Sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Rhodonite
Rhodonite, manganese inosilicate — MnSiO₃; the specimen may include quartz, feldspar, and black manganese-oxide minerals in the matrix
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Yellow Calcite
Calcium Carbonate, CaCO3
mineral
Sugilite
KNa2(Fe,Mn,Al)2Si12O30
mineral
Limonite / Iron Concretion
Limonite (FeO(OH)·nH2O)
mineral
Calcite crystal
Calcite (CaCO₃)
mineral
Tumbled yellow calcite
Calcite (CaCO₃)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Conglomeratic sedimentary rock (likely breccia/conglomerate)
Poorly sorted clastic rock with mixed lithic fragments; exact lithology cannot be confirmed from the image
sedimentary
Fine-grained brown sand or weathered soil
Unconsolidated siliciclastic sediment, likely quartz-rich sand (SiO₂) mixed with iron-oxide-coated grains
sedimentary
Milky quartz-bearing rock, possibly quartzite
Quartz (SiO₂), likely in a quartzite or quartz-rich vein
metamorphic
Yellow-orange quartz/chalcedony pebble (possibly citrine-bearing)
Quartz, SiO₂; likely microcrystalline chalcedony with iron staining
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Clear variety)
Silicon Dioxide (SiO2)
mineral
Dearest Ring (Gemstones)
Mixed Gemstones: Diamond (C), Emerald (Be3Al2Si6O18), Amethyst (SiO2), Ruby (Al2O3), Sapphire (Al2O3), Topaz (Al2SiO4(F,OH)2)
mineral
White quartz bead strand
Quartz, silicon dioxide (SiO₂), likely milky or translucent quartz; beads are polished and drilled
mineral
Black Onyx
Chalcedony (SiO2)
gemstone
Jasper
Microcrystalline Quartz (SiO2)
sedimentary
Limonite
FeO(OH)•nH2O
mineral
Iron-stained milky quartz
Quartz (SiO₂), with reddish-brown iron-oxide staining
mineral
Likely quartz-rich rock fragment
Unidentified pale, granular silicate specimen; possibly quartz or quartzite
mineral
White Quartz
Silicon Dioxide (SiO2)
mineral
Heliotrope
Chalcedony (SiO2) with Jasper/Hematite inclusions
mineral
Polished hematite bead (probable)
Hematite, Fe₂O₃
mineral
Polished/tumbled brown stone, likely jasper or chert
Microcrystalline quartz (SiO₂), possibly iron-rich jasper or chert
mineral
Weathered fine-grained stone, likely sandstone or quartzite
Quartz-rich sandstone (possibly weakly metamorphosed quartzite); predominantly SiO₂
sedimentary